Those are inlets (intakes). I call it ducted air because it really isn't doing anything other than providing a couple more channels for air to get to the intercooler. There shouldn't be a ram-air effect unless I put a scoop over the holes. The picture showing the holes with the shiny rings around them are the outlets in front of the intercooler. The intercooler goes up much higher, but due to the body design, that's as high as I could make them.

The original design of the radiator and intercooler layout put the radiator facing flat to the driver's side, and the intercooler at a 45 degree angle to the radiator. You can't even see the face of it in any of the pictures. Therefore, whatever air get pulled through it is almost an afterthought, so I'm hoping this will help it along some.

im trying to figure out how that intercooler setup works at all unless your bus is hot and the fan is running... seems like you would get almost no air through when you need it most... ie climbing a hill or starting out with the blower spooled high...

That's what I was thinking too. If the main fan isn't turning, then I don't see how the intercooler would even work at all, unless the air intake temp is being monitored and the system can trip the fan for that condition as well.

On a cummins 8.3, there is a charge air override control valve widgulator that kicks the hydraulic fan motor into full power. With the charge air reaches a temp, it opens an electric solenoid valve and allows full hydro volume to motor.

Those are inlets (intakes). I call it ducted air because it really isn't doing anything other than providing a couple more channels for air to get to the intercooler. There shouldn't be a ram-air effect unless I put a scoop over the holes. The picture showing the holes with the shiny rings around them are the outlets in front of the intercooler. The intercooler goes up much higher, but due to the body design, that's as high as I could make them.

The original design of the radiator and intercooler layout put the radiator facing flat to the driver's side, and the intercooler at a 45 degree angle to the radiator. You can't even see the face of it in any of the pictures. Therefore, whatever air get pulled through it is almost an afterthought, so I'm hoping this will help it along some.

RE's are notorious for having poor airflow over the rad & intercooler. Typically, any given engine in an RE will have a much bigger rad than the same motor in an FE. Anything you can do to increase airflow is a bonus.

RE's are notorious for having poor airflow over the rad & intercooler. Typically, any given engine in an RE will have a much bigger rad than the same motor in an FE. Anything you can do to increase airflow is a bonus.

That's why I went for an IC bus. 2 YUUUUUGE vents in the back, plus flip up work steps, the tunnel, and a full size rad and fan. But then when it comes to buses, just like the Big 3, everyone has their preferred builder

As for the new air ducts, see how well they work and maybe consider turning them into ram air intakes if there isn't any improved cooling.